在keil中编译时老是编译不了，显示下面的东西，不知道什么问题？？？？
Build target 'Target 1'
assembling STARTUP.A51...
assembling Text2.ASM...
linking...
*** WARNING L30: MEMORY SPACE OVERLAP
FROM: C:000000H
TO: C:000003H
*** ERROR L127: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: ?C_START
MODULE: STARTUP.obj (?C_STARTUP)
*** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: ?C_START
MODULE: STARTUP.obj (?C_STARTUP)
ADDRESS: 1000017H
Program Size: data=9.0 xdata=0 const=0 code=28
Target not created
还弹出如图的框：
弄了很多次都是这样，用C程序好像不会这样，而汇编就会，是什么问题啊？？
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